Peter, in his plea, has sought the statement of a secret witness submitted to the court by the central agency.
The central agency, in its supplementary charge-sheet filed in February, has submitted a statement of an unnamed witness in a sealed cover.
The CBI had said that they were not revealing the identity or the statement of the witness as investigation was underway.
Meanwhile, the court has allowed Peter’s lawyer to meet him in the Arthur Road Jail here on July 8.
The special court on Friday gave copies of main accused Indrani Mukerjea’s former driver Shyamwar Rai’s confession to co-accused Sanjeev Khanna and others on a Bombay high court directive.
Rai was the first accused to be arrested in the case in August 2015, taking the lid off the murder, after he was picked up in connection with an arms case.
The trial court recently allowed Rai to turn an approver in the case and become a prosecution witness.